Long-distance lighting.



J. LAFITTE.

LONG DISTANCE LIGHTING.

APPLIOATION FILED JULY 25, 1908.

- 968,774. Patented Aug. 30,1910.

JOACHIM LAFITTE; or BL n ra;

LONG-DISTANCE LIGHTING: f

To all whom it may concern:

lle it known that I, JOACIIIM Larrrrn, a

citizen of the French Republic, and residing at Biarritz, France, haveinvented certain new and useful Improvements in Long-Distance Lighting,of which the following is a specification.

This invention relates to a system of intense lighting at long range bycircular di pel'sion ofrays [emanating from a luminous focus which,compared to well known sys tems in which one or two luminous pencils aregiven varied movements for the purpose of dispersing the rays on thesurface to be lighted, consists chiefly in a certain number ofprojectors or reflectors helically arranged on a rotary support aboutone and the same focus, so as to aflord free passage to the luminouspencils covering distinct zones, the shade intervals between thesepencils being themselves covered by the dispersion of the rays broughtinto movement, a. uniform and constant lighting ofthe-surface covered bythe apparatus being thus insured.

In the example illustrated, the invention is applied to a lamp postcarrying an electric arc regulator, but it could also be applied in anycase where any luminous focus, whetherelectric or of any other nature,is available.

In the accompanying drawing Figure 1 is a vertical elevation showing thechief arrangement of the system applied-to a construction of a lamp partwith several reflecting mirrors having an arc lamp for ordinary publiclighting. 2 shows the same arrangement in plan,

()n the top of the mast or pole at is arranged a recess 6 in which ismounted an electric motor a of suitable power. The armature c of thesaid motor is mounted in such manner that its core (Z should be able torotate vertically and be supported by a. frame 6 through-which it passeswith or without ball bearings, the latter frame 0 being made in onepiece 'with the machine or independent of the same.

In the construction illustrated, the end of the core (Z of the armatureof the dynamo, projecting beyond the frame 6, receives a. bracketcomprising a suitable number of helically curved branches j which startfrom the central core (Z and terminate with their upper ends at aprefer. bly' circular support (7. The said branches could be constitutedby ordinary curved or straight elements.

Specification of Letters Patent. Application filed Jing es" 190's.Serial No. 445,350.

(In the branches ing facespf which are toward-the ligh the axis ofrevolution, the: min i iug arranged side by side ahd-p'l' 1 ferentlevels-relatively to each other an t the source of "light,whilethein-curvatu and distance from the latter may 'dilfer itcbeproduced when cording to the effect to distributing the light. Onelectric current motor a, the or less quickly, carrying with it in thatmovement the reflectors which will then rotate about the focus inparallel planes.

When an electric motor is used in an apparatus using electricity forlighting, the motor might be in series with the apparatus, or suppliedwith electricity in any other manner.

being supplied to the mo'ii'hted a certain number, of reflectin amrrrors1h; the refle armature ad will rotate more The arrangement of reflectorson their branches is such that the ra s of the luminous focus 2',reflected by eac of them, pass through the opposite correspondininterval comprised between two other re ectors, in the form of acylindrical, or more or less conical, pencil in a special directionwhich may be difierent from that followed by the pencils of the othermirrors, or similar to it.

Taking into consideration: (1) the optical phenomena of the persistenceof luminous influence on the eye which after having been subjected tothe. action of a direct or reflected light, retains the impression for1/10 of a second even after the luminous emission is interrupted; (2)the result produced by each reflector in directing the pencil rojectedto a greater distance than that w would be reached by luminous rayswithout its use; (3) the to all the reflectors ,about the lumlnousfocus,--it will be sufficient, therefore, in order that thespace and theobjects situated in the said space in the neighborhood of the nentlylighted, make a fraction of a revolution corresponding at leastto thenumber of branches,- in less time than the phenomena of luminouspersistence lasts on the retina after the interruption of the lighting.

In the arrangement illustrated by way of example, the branches which aresupposed to be three in number, are helically arranged for the purposeof affording a more convenient passage to the rays reflected by eachlighting apparatus should appear perma-' that each reflector should ich'movement of revolution given source of light and at the same arrangementw 'c reflector, the S}%,%1efitting also by this which is liable todamage the insulating or fusible parts.

hat I claim as my invention and desire tosecure by Letters Patent is Ina long distance lighting device, means for supporting a source of light,sevsupporting said series of reflectors tance therefrom for the purposespecified.

2. In a long distance lighting device, a standard having a sou-rceoflight thereon, a rotary carrier, means upon said standard for rotatingsaid carrier, arms upon said carrier extendmg helically about saidsource 1 of light, a series of mirrors arranged u on each of said armsand at the same focal istance from the source of light, for the purposespecified.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

J OAOHIM LAFITTE.

Witnesses:

E Bonus, Eire. HERASSARY.

